public class e4_5{
  public static void main(String args[]){
    Rect ractangle = new Rect();
    ractangle.width=109.87;
    ractangle.height=25.18;
    double area=ractangle.getArea();
   System.out.println("矩形的面积："+area);
   Lader lader=new Lader ();
    lader.above=10.798;
    lader.bottom=156.65;
    lader.height=18.12;
    area=lader.getArea();
   System.out.println("梯形的面积："+area);
  }
}
